[ Sasha's backport helper bot ] Hi, The upstream commit SHA1 provided is correct: 7d3b793faaab1305994ce568b59d61927235f57b WARNING: Author mismatch between patch and upstream commit: Backport author: Bin Lan <bin.lan.cn@xxxxxxxxxxxxx> Commit author: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx> Status in newer kernel trees: 6.12.y | Present (exact SHA1) 6.11.y | Present (exact SHA1) 6.6.y | Present (different SHA1: 19c41869465c) Note: The patch differs from the upstream commit: --- --- - 2024-11-25 21:31:42.179789487 -0500 +++ /tmp/tmp.38G55Mxp3K 2024-11-25 21:31:42.172164427 -0500 @@ -1,3 +1,5 @@ +[ Upstream commit 7d3b793faaab1305994ce568b59d61927235f57b ] + When enabling access to the special register set, Receiver time-out and RHR interrupts can happen. In this case, the IRQ handler will try to read from the FIFO thru the RHR register at address 0x00, but address 0x00 is @@ -22,25 +24,27 @@ Signed-off-by: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx> Link: https://lore.kernel.org/r/20240723125302.1305372-3-hugo@xxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> +[ Resolve minor conflicts ] +Signed-off-by: Bin Lan <bin.lan.cn@xxxxxxxxxxxxx> --- drivers/tty/serial/sc16is7xx.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c -index 58696e05492ca..b4c1798a1df2a 100644 +index 7a9924d9b294..d7728920853e 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c -@@ -592,6 +592,8 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud) +@@ -545,6 +545,8 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud) SC16IS7XX_MCR_CLKSEL_BIT, prescaler == 1 ? 0 : SC16IS7XX_MCR_CLKSEL_BIT); + mutex_lock(&one->efr_lock); -+ - /* Backup LCR and access special register set (DLL/DLH) */ - lcr = sc16is7xx_port_read(port, SC16IS7XX_LCR_REG); ++ + /* Open the LCR divisors for configuration */ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, -@@ -606,6 +608,8 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud) - /* Restore LCR and access to general register set */ + SC16IS7XX_LCR_CONF_MODE_A); +@@ -558,6 +560,8 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud) + /* Put LCR back to the normal mode */ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr); + mutex_unlock(&one->efr_lock); @@ -48,3 +52,6 @@ return DIV_ROUND_CLOSEST((clk / prescaler) / 16, div); } +-- +2.34.1 + --- Results of testing on various branches: | Branch | Patch Apply | Build Test | |---------------------------|-------------|------------| | stable/linux-6.6.y | Success | Success |
